Rio Mount Dam
Rio Mount Dam is an earth dam located in Snohomish County, Washington, built in 1979. It carries a Low hazard potential classification.
About Rio Mount Dam
The primary purpose of Rio Mount Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hoahau (private). It impounds the Tr-stillaguamish River.
The dam stands 22 feet tall and stretches 300 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 60 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1979, the structure is 47 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Washington |
| County | Snohomish |
| River/Stream | Tr-stillaguamish River |
| Coordinates | 48.20347, -122.19937 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Length | 300 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 80 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | HoaHau |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01328 |
| Federal ID | WA01328 |
| More Info | State Dam Safety Program |